Sheena Iyenger and Mark Lepper set up an experiment in 2000. They wanted to see how adding more choices affected consumer behavior.

Their experiment was conducted in an upscale grocery store called Draeger's Supermarket in Menlo Park, California. The store was known for having a large assortment of products such as 250 varieties of mustard.

Iyenger and Lepper experimented with an in-store sampling booth with two variations. One variation offered 6 different varieties of jam. The other offered 24.

The display with 24 varieties of jam attracted more customers with 60 percent of passers-by stopping at the display compared to only 40 percent of people stopping at the display with just 6 varieties.

Surprisingly, people who encountered the display with just 6 varieties of jam were five times more likely to make a purchase than people who encountered 24 varieties.

It turns out that offering fewer choices can be good for business. Here's how.

Fewer Options = More Sales

A recent furniture shopping trip revealed how easy or complex a buying decision can be.

My wife and I found two furniture stores that offered sofas we liked. One was Living Spaces. They really did service the right way and we ended up buying a sofa and a love seat from them. (A recent blog post described other ways that Living Spaces does service right.)

One of the biggest differentiators between the two stores was the number of options available.

Living Spaces had a much larger selection of sofas. However, their helpful salesperson narrowed it down to just a few choices once we described what we were looking for. Each choice had a simple one-page sales sheet that visually depicted the various size and configuration options. Making a choice was easy.

The other furniture store overwhelmed us with choices. One sofa that looked promising had a complex code book full of possible configurations. Even the salesperson struggled to decipher it all. There were six different options for the arms alone. It was too much.

Fewer Options = Lower Costs

Costco is famous for keeping its costs low and passing on those savings to its members. One of the ways it does this is by offering fewer options than its competitors.

The graph below shows the approximate number of individual items sold at Costo and its two major rivals, Sam's Club and BJ's.

Data Source: iStockAnalyst

Notice that Costco has 24 percent fewer items than Sam's and 46 percent fewer items than BJ's. Having fewer items allows Costco to rely on fewer employees to maintain inventory in it's stores. It also enables the chain to negotiate better deals from its vendors and offer lower prices to its customers.

The staggering number of menu items causes a lot of operational problems as employees struggle to keep up with so many options. One study found that 12 percent of McDonald's drive-through orders contained an error.

Compare this to fast food champ In-N-Out. They're consistently rated extremely high in both customer service and food quality. One big difference? The In-N-Out menu contains just six items.

Solutions

One of my favorite customer service books is Uncommon Service. It describes the need for trade-offs. A business can only be really, really good at something if it's willing to be not so good at a few other things.

This book provides a great lesson in simplicity.

If you want to delight your customers, offer great prices, and make your operations run like a well-oiled machine, you need to sacrifice selection.

Your customers, and your employees, will appreciate it in the long run.